/* Copyright 2009
 *
 * This program and the accompanying materials
 * are made available under the terms of the
 * Eclipse Public License v1.0 which accompanies
 * this distribution, and is available at
 *
 * 		http://www.eclipse.org/legal/epl-v10.html
 *
 * Unless required by applicable law or agreed to in
 * writing, software distributed under the License is
 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES
 * OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing
 * permissions and limitations under the License.
 *
 * Contributors:
 * 	   IBM Corporation - initial API and implementation for JDT/DLTK
 *     Sean W. Quinn - initial adoption for use with PHP from various sources.
 */
package org.eclipse.php.internal.core.util;

import org.eclipse.php.core.util.IConstantPool;
import org.eclipse.php.core.util.IConstantPoolConstant;
import org.eclipse.php.core.util.IConstantPoolEntry;
import org.eclipse.php.core.util.ILocalVariableTableEntry;
import org.eclipse.php.core.util.ScriptFormatException;

/**
 * Default implementation of ILocalVariableTableEntry
 */
public class LocalVariableTableEntry extends ScriptFileStruct implements ILocalVariableTableEntry {

	private int startPC;
	private int length;
	private int nameIndex;
	private int descriptorIndex;
	private char[] name;
	private char[] descriptor;
	private int index;

	/**
	 * Constructor for LocalVariableTableEntry.
	 *
	 * @param classFileBytes
	 * @param constantPool
	 * @param offset
	 * @throws ScriptFormatException
	 */
	public LocalVariableTableEntry(byte[] classFileBytes, IConstantPool constantPool, int offset)
			throws ScriptFormatException {
		this.startPC = u2At(classFileBytes, 0, offset);
		this.length = u2At(classFileBytes, 2, offset);
		this.nameIndex = u2At(classFileBytes, 4, offset);
		this.descriptorIndex = u2At(classFileBytes, 6, offset);
		this.index = u2At(classFileBytes, 8, offset);
		IConstantPoolEntry constantPoolEntry = constantPool.decodeEntry(this.nameIndex);
		if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Utf8) {
			throw new ScriptFormatException(ScriptFormatException.INVALID_CONSTANT_POOL_ENTRY);
		}
		this.name = constantPoolEntry.getUtf8Value();
		constantPoolEntry = constantPool.decodeEntry(this.descriptorIndex);
		if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Utf8) {
			throw new ScriptFormatException(ScriptFormatException.INVALID_CONSTANT_POOL_ENTRY);
		}
		this.descriptor = constantPoolEntry.getUtf8Value();
	}

	/**
	 * @see ILocalVariableTableEntry#getStartPC()
	 */
	public int getStartPC() {
		return this.startPC;
	}

	/**
	 * @see ILocalVariableTableEntry#getLength()
	 */
	public int getLength() {
		return this.length;
	}

	/**
	 * @see ILocalVariableTableEntry#getNameIndex()
	 */
	public int getNameIndex() {
		return this.nameIndex;
	}

	/**
	 * @see ILocalVariableTableEntry#getDescriptorIndex()
	 */
	public int getDescriptorIndex() {
		return this.descriptorIndex;
	}

	/**
	 * @see ILocalVariableTableEntry#getIndex()
	 */
	public int getIndex() {
		return this.index;
	}

	/**
	 * @see ILocalVariableTableEntry#getName()
	 */
	public char[] getName() {
		return this.name;
	}

	/**
	 * @see ILocalVariableTableEntry#getDescriptor()
	 */
	public char[] getDescriptor() {
		return this.descriptor;
	}
}
